24 PHYLLOTHECA. 



imperfectly known ; a loose strobilus consisting of alternate -whorls 

 of bracts and clusters of sporangiopbores. 



This species is imperfectly known. The stem- and pith-casts 

 are generally broader, stouter, and more coarsely sulcate than 

 those of Phyllotheca australis or P. indica. The leaves of this 

 species are known only from the imperfect specimens figured by 

 Schnialhausen from the Altai and Siberia. Pith-casts very similar, 

 so far as one can judge from such imperfect fragments, to those 

 figured by Schmalhausen, occur in the Permo-Carboniferous rocks 

 of Australia and possibly also in India and South Africa. Several 

 specimens from New South Wales, described by McCoy in 1847 

 as P. Hooker i (in part), and now preserved in the Sedgwick 

 Museum, Cambridge, have been referred to this species. 1 Some 

 of these were recognized by Schmalhausen in 1879 as identical 

 with Goppert's species. The internodes of these casts vary 

 from 1*5 to 3 cm. in breadth, and bear from 35 to 45 sharp 

 longitudinal ridges separated by shallow grooves, about 1 mm. 

 across. 



It is possible that a somewhat similar cast figured by Bunbury 2 

 in 1861 from Nagpur, India, may belong to this species. As this 

 specimen is not to be found among Bunbury's collection, preserved 

 in the Museum of the Geological Society of London, I have not 

 been able to determine whether this is really the case. Possibly 

 also the specimen figured by Feistniantel 3 as an Equisetaceous 

 stem may belong to Goppert's species. 



Lastly, the Phyllotheca from Zululand, recently figured by 

 Etheridge (see p. 29), may prove eventually to belong to 

 P. deliquescens. 



The fructification of this species is known only from Schmal- 

 hausen's 4 specimens. The loose cone here consists of alternations 

 of whorls of sterile bracts with clusters of peltate sporangiophores. 



Known from New South Wales and possibly also from India and 

 South Africa. P. deliquescens also occurs in Northern Asia. 



Not represented in the British Museum collection. 



1 Arber (02 1 ), pp. 17, 22. 



2 Bunbury (61), pi. xi, fig. 1. 



3 Feistmantel (80), pi. xiii a, fig. 7. 



* Schmalhausen (79), pi. ix ; Solms-Laubach (91), p. 181, fig. 17b. 



